I have been fighting this problem too. I let everyone free range and I even culled my roosters last year because they did it. This is only our 3rd year with fowl. I started with some dual purpose chickens but the roosters in the bunch were so "duck affectionate" they hurt and killed a duck. So last year I bought some Orpington's, hoping to beef up my flock since I found my "dual purpose" birds were great layers but pretty tiny to eat. I culled the first year's duck loving dual purpose roosters and put them to better use in my kitchen thinking the Orpington cockerels could service the ladies this year... Nope. All they want is duck. I put my best Orpington's together in a "private honeymoon suite" for three weeks hoping to get some little ones to hatch. Not even ONE of the eggs were fertilized. When I turned them loose, he ran like crazy and was all, "Duck, duck duck! Duck, duck, duck!" SMH. In the meantime, someone I know bought an Old English Bantam rooster for a "pet," not realizing apparently that chickens poop, a lot, and everywhere. I took "Rooty" in, thinking the poor guy would be the little misfit tag along. Nope. He is THE rooster. He runs the flock, the hens love him, follow him, grouped around him everywhere he goes. He's teeny tiny, so they actually lay down for him to mount them. ***sigh*** Bantam x Dual Purpose crosses do NOT = Meatier birds. And the Orpington's are off buggering the ducks bald! So much for them. The kids won't let me find a new home for the prolific "Rooty" who makes sure ALL eggs are fertilized! The Orpington's are going in a pot. I invested in 20 Australorps with 2 cockerels last month. I'm keeping them separate from the ducks and Rooty's flock until after they are laying well and the roosters are proving to be doing their job. Unless, of course I figure out how to stop the madness before hand.